<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
    <div id="app"></div>
    <script type="text/babel">
    /*
     porps是用来做父子组件通信的
     -在父组件中使用子组件的时候，可以给子组件添加属性
     -在子组件中组件实例的props属性上，就能拿到这个属性和值
    <Child a ={1} car={car}/>这个是子组件使用父组件的代码a={1}这个是属性
     */    
   class Parent extends React.Component{
    state = {
        car:"奔驰"
    }
    render(){
        const{car}=this.state;
        return(
            <div>
                <h1>我是父组件</h1>
                <p>我开的车是{car}</p>
                <hr/>
                <Child a ={1} car={car}/>
            </div>
        )
    }
   }
    class Child extends React.Component{
        render(){
           console.log("Child组件实例",this);
            //这里就是要指向原型直接去解构
           const {car}=this.props;
            return(
                <p>我是儿子，我开我父级的车</p>
            )
        }
    }
   
   const root =ReactDOM.createRoot(document.getElementById('app'));
   root.render(<Parent/>)
   </script>
</body>
</html>